20171988

素因数分解:

$2^2\times 3^2\times {\mathrm{43}}^1\times {\mathrm{83}}^1\times {\mathrm{157}}^1$

素因数の和:293

約数の個数: 72

約数和(自身を含む): 53141088

約数和(自身を除く): 32969100

約数列:

[1, 2, 3, 4, 6, 9, 12, 18, 36, 43, 83, 86, 129, 157, 166, 172, 249, 258, 314, 332, 387, 471, 498, 516, 628, 747, 774, 942, 996, 1413, 1494, 1548, 1884, 2826, 2988, 3569, 5652, 6751, 7138, 10707, 13031, 13502, 14276, 20253, 21414, 26062, 27004, 32121, 39093, 40506, 42828, 52124, 60759, 64242, 78186, 81012, 117279, 121518, 128484, 156372, 234558, 243036, 469116, 560333, 1120666, 1680999, 2241332, 3361998, 5042997, 6723996, 10085994, 20171988]

約数ペア:

[(1, 20171988), (2, 10085994), (3, 6723996), (4, 5042997), (6, 3361998), (9, 2241332), (12, 1680999), (18, 1120666), (36, 560333), (43, 469116), (83, 243036), (86, 234558), (129, 156372), (157, 128484), (166, 121518), (172, 117279), (249, 81012), (258, 78186), (314, 64242), (332, 60759), (387, 52124), (471, 42828), (498, 40506), (516, 39093), (628, 32121), (747, 27004), (774, 26062), (942, 21414), (996, 20253), (1413, 14276), (1494, 13502), (1548, 13031), (1884, 10707), (2826, 7138), (2988, 6751), (3569, 5652)]